Fix one broken link

src/arc-mutex/arc-clone.md

@@ -28,7 +28,7 @@ happens-before relationship but is atomic. When `Drop`ping the Arc, however,
 we'll need to atomically synchronize when decrementing the reference count. This
 is described more in [the section on the `Drop` implementation for
 `Arc`](arc-drop.md). For more information on atomic relationships and Relaxed
-ordering, see [the section on atomics](../atomics.md).
+ordering, see [the section on atomics](../atomics/atomics.md).
 
 Thus, the code becomes this: